Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05547755 SQUAW CREEK AT ROUND LAKE, IL

Observed annual peak-flood magnitudes were adjusted to 2010 land-use conditions on the basis of panel data regression model with fixed effect analysis. The symbols presented in the figure are: "observed annual peaks", "adjusted annual peaks", and "fraction of urbanization in the watershed"

Legend for Graph

Water year Segment Discharge code Cumulative reservoir storage (acre-feet) Urban fraction Precipitation (inches) Observed peak discharge (ft3/s) Adjusted peak discharge (ft3/s) Exceedance probability
1990 1 -- 62 0.066 0.548 153 228 0.546
1991 1 -- 62 0.079 0.898 168 245 0.486
1992 1 E 62 0.092 0.592 89 141 0.836
1993 1 -- 62 0.105 0.812 312 415 0.135
1994 1 -- 62 0.117 0.605 225 305 0.314
1995 1 -- 62 0.130 1.009 142 200 0.646
1996 1 D 62 0.143 0.886 299 385 0.168
1997 1 -- 62 0.156 2.083 232 303 0.319
1998 1 E 62 0.169 0.495 149 201 0.644
1999 1 -- 62 0.181 1.017 187 244 0.492
2000 1 -- 62 0.194 1.923 200 256 0.452
2001 1 -- 62 0.217 0.745 265 323 0.271
2002 1 -- 62 0.239 1.839 236 285 0.367
2003 1 CE 62 0.261 0.676 86 111 0.912
2004 1 C 62 0.284 2.119 196 228 0.546
2005 1 CE 62 0.306 0.638 102 121 0.889